I created flight plan from ksfo to ymml it is almost 14:45 total time. It is almost 7000 NM distance. When I generate flight plan it comes up with error max distance with negative fuel almost -3600 gallons. I thought A350-900 can fly upto 17 to 18 hours non stop. I real life I flown in A350-900 almost 15 and 1/2 hours without any refuel.
Please advise
